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        <li class="header">Part I</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
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        </li>
    
        <li class="chapter " data-level="1.2" data-path="../C++必知必会的知识点/">
            
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                    C++必知必会的知识点
            
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                    如何成为一名合格的C/C++开发者？
            
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        <li class="chapter " data-level="1.2.2" data-path="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                <a href="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                    
                    不定参数函数实现var_arg系列的宏
            
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        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                <a href="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                    
                    你一定要搞明白的C函数调用方式与栈原理
            
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        <li class="chapter " data-level="1.2.4" data-path="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
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                    深入理解C/C++中的指针
            
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                    详解C++11中的智能指针
            
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                    C++17结构化绑定
            
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                    C++必须掌握的pimpl惯用法
            
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                <a href="../C++必知必会的知识点/用VisualStudio调试Linux程序.html">
            
                    
                    用Visual Studio调试Linux程序
            
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        <li class="chapter " data-level="1.2.9" data-path="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                <a href="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                    
                    如何使用Visual Studio管理和阅读开源项目代码
            
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        <li class="chapter " data-level="1.2.10" data-path="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
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                    利用cmake工具生成Visual Studio工程文件
            
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        <li class="chapter " data-level="1.3" data-path="../多线程/">
            
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                    多线程
            
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        <li class="chapter " data-level="1.3.1" data-path="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                <a href="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                    
                    后台C++开发你一定要知道的条件变量
            
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        <li class="chapter " data-level="1.3.2" data-path="../多线程/整型变量赋值是原子操作吗？.html">
            
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                    整型变量赋值是原子操作吗？
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../网络编程/">
            
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                    网络编程
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" data-path="../网络编程/bind函数重难点解析.html">
            
                <a href="../网络编程/bind函数重难点解析.html">
            
                    
                    bind 函数重难点解析
            
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        <li class="chapter " data-level="2.1.2" data-path="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                <a href="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                    
                    connect 函数在阻塞和非阻塞模式下的行为
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3" data-path="../网络编程/select函数重难点解析.html">
            
                <a href="../网络编程/select函数重难点解析.html">
            
                    
                    select 函数重难点解析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4" data-path="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                <a href="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                    
                    Linux epoll 模型（含LT 模式和 ET 模式详解）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5" data-path="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                <a href="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                    
                    socket 的阻塞模式和非阻塞模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                    
                    非阻塞模式下 send 和 recv 函数的返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
            
                <a href="../网络编程/服务器开发通信协议设计介绍.html">
            
                    
                    服务器开发通信协议设计介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                    
                    TCP 协议如何解决粘包、半包问题
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
            
                <a href="../网络编程/网络通信中收发数据的正确姿势.html">
            
                    
                    网络通信中收发数据的正确姿势
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                    
                    服务器端发数据时，如果对端一直不收，怎么办？
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
            
                <a href="../程序员必知必会的网络命令/">
            
                    
                    程序员必知必会的网络命令
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                    
                    利用telnet命令发电子邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                    
                    做Java或者C++开发都应该知道的lsof命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                    
                    Linux网络故障排查的瑞士军刀nc命令
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                    
                    Linux tcpdump使用详解
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                    
                    从抓包的角度分析connect函数的连接过程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                    
                    服务器开发中网络数据分析与故障排查经验漫谈
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part II</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
            
                <a href="../高性能服务器框架设计/">
            
                    
                    高性能服务器框架设计
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                    
                    主线程与工作线程的分工
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
            
                <a href="../高性能服务器框架设计/Reactor模式.html">
            
                    
                    Reactor模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                    
                    实例：一个服务器程序的架构介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
            
                <a href="../高性能服务器框架设计/错误码系统的设计.html">
            
                    
                    错误码系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
            
                <a href="../高性能服务器框架设计/日志系统的设计.html">
            
                    
                    日志系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                    
                    如何设计断线自动重连机制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                    
                    心跳包机制设计详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                    
                    业务数据处理一定要单独开线程吗
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                    
                    C++ 高性能服务器网络框架设计细节
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
            
                <a href="../服务器开发案例实战/">
            
                    
                    服务器开发案例实战
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
            
                <a href="../服务器开发案例实战/从零实现一个http服务器.html">
            
                    
                    从零实现一个http服务器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                    
                    从零实现一款12306刷票软件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                    
                    从零实现一个邮件收发客户端
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                    
                    从零开发一个WebSocket服务器
            
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        <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                    
                    从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
            
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        <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
            
                <a href="../服务器开发案例实战/2最后一战概况.html">
            
                    
                    从零学习开源项目系列（二） 最后一战概况
            
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        </li>
    
        <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                    
                    从零学习开源项目系列（三） CSBattleMgr服务源码研究
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
            
                <a href="../服务器开发案例实战/4LogServer源码探究.html">
            
                    
                    从零学习开源项目系列（四）LogServer源码探究
            
                </a>
            

            
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            </ul>
            
        </li>
    

    
        
        <li class="header">Part III</li>
        
        
    
        <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
            
                <a href="../TeamTalk源码解析/">
            
                    
                    TeamTalk IM源码分析
            
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        <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
            
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                    01 TeamTalk介绍
            
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        <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                    
                    02 服务器端的程序的编译与部署
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
                <a href="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
                    
                    03 服务器端的程序架构介绍
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
            
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                    04 服务器端db_proxy_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
            
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                    05 服务器端msg_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
            
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                    06 服务器端login_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
            
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                    07 服务器端msfs源码分析
            
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        <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
            
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                    08 服务器端file_server源码分析
            
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        <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
            
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                    09 服务器端route_server源码分析
            
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        <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                    
                    10 开放一个TeamTalk测试服务器地址和几个测试账号
            
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        <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
            
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                    11 pc客户端源码分析
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
            
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                    libevent源码深度剖析
            
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                    libevent源码深度剖析01
            
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        <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
            
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                    libevent源码深度剖析02
            
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        <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
            
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                    libevent源码深度剖析03
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
            
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                    libevent源码深度剖析04
            
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        <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
            
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                    libevent源码深度剖析05
            
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        <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
            
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                    libevent源码深度剖析06
            
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        <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
            
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                    libevent源码深度剖析07
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
            
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                    libevent源码深度剖析08
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
            
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                    libevent源码深度剖析09
            
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        <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
            
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                    libevent源码深度剖析10
            
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        <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
            
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                    libevent源码深度剖析11
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                <a href="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                    
                    libevent源码深度剖析12
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
            
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                    libevent源码深度剖析13
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="./">
            
                <a href="./">
            
                    
                    leveldb源码分析
            
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        <li class="chapter " data-level="7.2.1" data-path="leveldb源码分析1.html">
            
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                    leveldb源码分析1
            
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        <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
            
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                    leveldb源码分析2
            
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        <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
            
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                    leveldb源码分析3
            
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        <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
            
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                    leveldb源码分析4
            
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        <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
            
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                    leveldb源码分析5
            
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        <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
            
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                    leveldb源码分析6
            
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        <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
            
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                    leveldb源码分析7
            
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        <li class="chapter " data-level="7.2.8" data-path="leveldb源码分析8.html">
            
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                    leveldb源码分析8
            
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        </li>
    
        <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
            
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                    leveldb源码分析9
            
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        </li>
    
        <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
            
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                    leveldb源码分析10
            
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        <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
            
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                    leveldb源码分析11
            
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        <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
            
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                    leveldb源码分析12
            
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        <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
            
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                    leveldb源码分析13
            
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        <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
            
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                    leveldb源码分析14
            
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        <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
            
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                    leveldb源码分析15
            
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        <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
            
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                    leveldb源码分析16
            
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        <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
            
                <a href="leveldb源码分析17.html">
            
                    
                    leveldb源码分析17
            
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        <li class="chapter active" data-level="7.2.18" data-path="leveldb源码分析18.html">
            
                <a href="leveldb源码分析18.html">
            
                    
                    leveldb源码分析18
            
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        <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
            
                <a href="leveldb源码分析19.html">
            
                    
                    leveldb源码分析19
            
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        <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
            
                <a href="leveldb源码分析20.html">
            
                    
                    leveldb源码分析20
            
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        <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
            
                <a href="leveldb源码分析21.html">
            
                    
                    leveldb源码分析21
            
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        <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
            
                <a href="leveldb源码分析22.html">
            
                    
                    leveldb源码分析22
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
            
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                    Memcached源码分析
            
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        <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
            
                <a href="../Memcached源码分析/00服务器资源调整.html">
            
                    
                    00 服务器资源调整
            
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        <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
            
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                    01 初始化参数解析
            
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        <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
            
                <a href="../Memcached源码分析/02网络监听的建立.html">
            
                    
                    02 网络监听的建立
            
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        <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
            
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                    03 网络连接建立
            
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        <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
            
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                    04 内存初始化
            
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        <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
            
                <a href="../Memcached源码分析/05资源初始化.html">
            
                    
                    05 资源初始化
            
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        <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
            
                <a href="../Memcached源码分析/06get过程.html">
            
                    
                    06 get过程
            
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        <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
            
                <a href="../Memcached源码分析/07cas属性.html">
            
                    
                    07 cas属性
            
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        <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
            
                <a href="../Memcached源码分析/08内存池.html">
            
                    
                    08 内存池
            
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        <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
            
                <a href="../Memcached源码分析/09连接队列.html">
            
                    
                    09 连接队列
            
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        <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
            
                <a href="../Memcached源码分析/10Hash表操作.html">
            
                    
                    10 Hash表操作
            
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        <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
            
                <a href="../Memcached源码分析/12set操作.html">
            
                    
                    12 set操作
            
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        <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
            
                <a href="../Memcached源码分析/13do_item_alloc操作.html">
            
                    
                    13 do_item_alloc操作
            
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        <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
            
                <a href="../Memcached源码分析/14item结构.html">
            
                    
                    14 item结构
            
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        <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
            
                <a href="../Memcached源码分析/15Hash表扩容.html">
            
                    
                    15 Hash表扩容
            
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        <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
            
                <a href="../Memcached源码分析/16线程交互.html">
            
                    
                    16 线程交互
            
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        <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
            
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                    17 状态机
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
            
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                    游戏开发专题
            
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                    1 游戏服务器开发的基本体系与服务器端开发的一些建议
            
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        <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
            
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                    2 网络游戏服务器开发框架设计介绍
            
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        <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
            
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                    3 游戏后端开发需要掌握的知识
            
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        <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
            
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                    4 关于游戏服务端架构的整理
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
            
                <a href="../游戏开发专题/5各类游戏对应的服务端架构.html">
            
                    
                    5 各类游戏对应的服务端架构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
                <a href="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
                    
                    6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
                <a href="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
                    
                    7 QQ游戏百万人同时在线服务器架构实现
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
                <a href="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
                    
                    8 大型多人在线游戏服务器架构设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
            
                <a href="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
            
                    
                    9 百万用户级游戏服务器架构设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
            
                <a href="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
            
                    
                    10 十万在线的WebGame的数据库设计思路
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
            
                <a href="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
            
                    
                    11 一种高性能网络游戏服务器架构设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.12" data-path="../游戏开发专题/12经典游戏服务器端架构概述.html">
            
                <a href="../游戏开发专题/12经典游戏服务器端架构概述.html">
            
                    
                    12 经典游戏服务器端架构概述
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.13" data-path="../游戏开发专题/13游戏跨服架构进化之路.html">
            
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                    13 游戏跨服架构进化之路
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part IV</li>
        
        
    
        <li class="chapter " data-level="10.1" data-path="../程序员面试题精讲/">
            
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                    程序员面试题精讲
            
                </a>
            

            
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        <li class="chapter " data-level="10.1.1" data-path="../程序员面试题精讲/腾讯后台开发实习生技能要求.html">
            
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                    腾讯后台开发实习生技能要求
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="10.1.2" data-path="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
            
                <a href="../程序员面试题精讲/聊聊如何拿大厂的offer.html">
            
                    
                    聊聊如何拿大厂的 offer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="10.1.3" data-path="../程序员面试题精讲/网络通信题目集锦.html">
            
                <a href="../程序员面试题精讲/网络通信题目集锦.html">
            
                    
                    网络通信题目集锦
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="10.1.4" data-path="../程序员面试题精讲/我面试后端开发经理的经历.html">
            
                <a href="../程序员面试题精讲/我面试后端开发经理的经历.html">
            
                    
                    我面试后端开发经理的经历
            
                </a>
            

            
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        <li class="chapter " data-level="10.1.5" data-path="../程序员面试题精讲/LinuxCC++后端开发面试问哪些问题.html">
            
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                    Linux C/C++后端开发面试问哪些问题
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="10.2" data-path="../职业规划/">
            
                <a href="../职业规划/">
            
                    
                    职业规划
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.2.1" data-path="../职业规划/给工作4年迷茫的程序员们的一点建议.html">
            
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                    给工作 4 年迷茫的程序员们的一点建议
            
                </a>
            

            
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        <li class="chapter " data-level="10.2.2" data-path="../职业规划/聊聊技术人员的常见的职业问题.html">
            
                <a href="../职业规划/聊聊技术人员的常见的职业问题.html">
            
                    
                    聊聊技术人员的常见的职业问题
            
                </a>
            

            
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        <li class="chapter " data-level="10.2.3" data-path="../职业规划/写给那些傻傻想做服务器开发的朋友.html">
            
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                    写给那些傻傻想做服务器开发的朋友
            
                </a>
            

            
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            </ul>
            
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        <li class="chapter " data-level="10.3" data-path="../自我提升与开源代码/">
            
                <a href="../自我提升与开源代码/">
            
                    
                    自我提升与开源代码
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.3.1" data-path="../自我提升与开源代码/2020年好好读一读开源代码吧.html">
            
                <a href="../自我提升与开源代码/2020年好好读一读开源代码吧.html">
            
                    
                    2020 年好好读一读开源代码吧
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="10.4" data-path="../后端开发相关的书籍/">
            
                <a href="../后端开发相关的书籍/">
            
                    
                    后端开发相关的书籍
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.4.1" data-path="../后端开发相关的书籍/后台开发应该读的书.html">
            
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                    后台开发应该读的书
            
                </a>
            

            
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            </ul>
            
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        <li class="chapter " data-level="10.5" data-path="../程序员的简历/">
            
                <a href="../程序员的简历/">
            
                    
                    程序员的简历
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.5.1" data-path="../程序员的简历/程序员如何写简历.html">
            
                <a href="../程序员的简历/程序员如何写简历.html">
            
                    
                    程序员如何写简历
            
                </a>
            

            
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            </ul>
            
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        <li class="chapter " data-level="10.6" data-path="../程序员的薪资与年终奖那些事儿/">
            
                <a href="../程序员的薪资与年终奖那些事儿/">
            
                    
                    程序员的薪资与年终奖那些事儿
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="10.6.1" data-path="../程序员的薪资与年终奖那些事儿/技术面试与HR谈薪资技巧.html">
            
                <a href="../程序员的薪资与年终奖那些事儿/技术面试与HR谈薪资技巧.html">
            
                    
                    技术面试与HR谈薪资技巧
            
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                    聊一聊程序员如何增加收入
            
                </a>
            

            
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        <li class="chapter " data-level="10.6.3" data-path="../程序员的薪资与年终奖那些事儿/谈一谈年终奖.html">
            
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                    谈一谈年终奖
            
                </a>
            

            
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        <li class="chapter " data-level="10.7" data-path="../程序员的烦心事/">
            
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                    程序员的烦心事
            
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                <a href="../程序员的烦心事/拒绝了一家公司的offer后，他们的副总和hr总监同时打电话来询问拒绝原因并极力要求加入，我该不该去？.html">
            
                    
                    拒绝了一家公司的offer后，他们的副总和hr总监同时打电话来询问拒绝原因并极力要求加入，我该不该去？
            
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        <li class="chapter " data-level="10.7.2" data-path="../程序员的烦心事/我是一名程序员，结婚时女友要求我用两年的工资作为彩礼，我该不该答应？.html">
            
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                    我是一名程序员，结婚时女友要求我用两年的工资作为彩礼，我该不该答应？
            
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        <li class="chapter " data-level="10.8" data-path="../作者的故事/">
            
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                    作者的故事
            
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                    我的 2019
            
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                    我是如何年薪五十万的
            
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						<div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18"><b></b>leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18</a></li><ul><ul><li><span class="title-icon "></span><a href="#111-versionset&#x63A5;&#x53E3;"><b></b>11.1 VersionSet&#x63A5;&#x53E3;</a></li><li><span class="title-icon "></span><a href="#112-versionsetbuilder&#x7C7B;"><b></b>11.2 VersionSet::Builder&#x7C7B;</a></li><li><span class="title-icon "></span><a href="#113-recover"><b></b>11.3 Recover()</a></li></ul></ul></ul></div><h1 id="leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18"><a name="leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18" class="anchor-navigation-ex-anchor" href="#leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18"><i class="fa fa-link" aria-hidden="true"></i></a>leveldb&#x6E90;&#x7801;&#x5206;&#x6790;18</h1>
<p>&#x672C;&#x7CFB;&#x5217;&#x300A;leveldb&#x6E90;&#x7801;&#x5206;&#x6790;&#x300B;&#x5171;&#x6709;22&#x7BC7;&#x6587;&#x7AE0;&#xFF0C;&#x8FD9;&#x662F;&#x7B2C;&#x5341;&#x516B;&#x7BC7;</p>
<p><strong>11 VersionSet&#x5206;&#x6790;&#x4E4B;1</strong>
<code>Version</code>&#x4E4B;&#x540E;&#x5C31;&#x662F;<code>VersionSet</code>&#xFF0C;&#x5B83;&#x5E76;&#x4E0D;&#x662F;Version&#x7684;&#x7B80;&#x5355;&#x96C6;&#x5408;&#xFF0C;&#x8FD8;&#x80A9;&#x8D1F;&#x4E86;&#x4E0D;&#x5C11;&#x7684;&#x5904;&#x7406;&#x903B;&#x8F91;&#x3002;&#x8FD9;&#x91CC;&#x7684;&#x5206;&#x6790;&#x4E0D;&#x6D89;&#x53CA;&#x5230;<code>compaction</code>&#x76F8;&#x5173;&#x7684;&#x90E8;&#x5206;&#xFF0C;&#x8FD9;&#x90E8;&#x5206;&#x4F1A;&#x5355;&#x72EC;&#x5206;&#x6790;&#x3002;&#x5305;&#x62EC;log&#x7B49;&#x5404;&#x79CD;&#x7F16;&#x53F7;&#x8BA1;&#x6570;&#x5668;&#xFF0C;compaction&#x70B9;&#x7684;&#x7BA1;&#x7406;&#x7B49;&#x7B49;&#x3002;</p>
<h3 id="111-versionset&#x63A5;&#x53E3;"><a name="111-versionset&#x63A5;&#x53E3;" class="anchor-navigation-ex-anchor" href="#111-versionset&#x63A5;&#x53E3;"><i class="fa fa-link" aria-hidden="true"></i></a>11.1 VersionSet&#x63A5;&#x53E3;</h3>
<p><strong>1 &#x9996;&#x5148;&#x662F;&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;VersionSet&#x4F1A;&#x4F7F;&#x7528;&#x5230;TableCache&#xFF0C;&#x8FD9;&#x4E2A;&#x662F;&#x8C03;&#x7528;&#x8005;&#x4F20;&#x5165;&#x7684;&#x3002;TableCache&#x7528;&#x4E8E;Get k/v&#x64CD;&#x4F5C;&#x3002;</strong></p>
<pre class="language-"><code>VersionSet(const std::string&amp; dbname, const Options* options,
           TableCache*table_cache, const InternalKeyComparator*);
</code></pre><p><code>VersionSet</code>&#x7684;&#x6784;&#x9020;&#x51FD;&#x6570;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x9664;&#x4E86;&#x6839;&#x636E;&#x53C2;&#x6570;&#x521D;&#x59CB;&#x5316;&#xFF0C;&#x8FD8;&#x6709;&#x4E24;&#x4E2A;&#x5730;&#x65B9;&#x503C;&#x5F97;&#x6CE8;&#x610F;&#xFF1A;
<strong>N1</strong> next<em>file_number</em>&#x4ECE;2&#x5F00;&#x59CB;&#xFF1B;
<strong>N2</strong> &#x521B;&#x5EFA;&#x65B0;&#x7684;Version&#x5E76;&#x52A0;&#x5165;&#x5230;Version&#x94FE;&#x8868;&#x4E2D;&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;CURRENT=&#x65B0;&#x521B;&#x5EFA;version&#xFF1B;
&#x5176;&#x5B83;&#x7684;&#x6570;&#x5B57;&#x521D;&#x59CB;&#x5316;&#x4E3A;0&#xFF0C;&#x6307;&#x9488;&#x521D;&#x59CB;&#x5316;&#x4E3A;NULL&#x3002;
<strong>2 &#x6062;&#x590D;&#x51FD;&#x6570;&#xFF0C;&#x4ECE;&#x78C1;&#x76D8;&#x6062;&#x590D;&#x6700;&#x540E;&#x4FDD;&#x5B58;&#x7684;&#x5143;&#x4FE1;&#x606F;</strong></p>
<pre class="language-"><code>Status Recover();
</code></pre><p><strong>3 &#x6807;&#x8BB0;&#x6307;&#x5B9A;&#x7684;&#x6587;&#x4EF6;&#x7F16;&#x53F7;&#x5DF2;&#x7ECF;&#x88AB;&#x4F7F;&#x7528;&#x4E86;</strong></p>
<pre class="language-"><code>void MarkFileNumberUsed(uint64_t number);
</code></pre><p>&#x903B;&#x8F91;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x5C31;&#x662F;&#x6839;&#x636E;&#x7F16;&#x53F7;&#x66F4;&#x65B0;&#x6587;&#x4EF6;&#x7F16;&#x53F7;&#x8BA1;&#x6570;&#x5668;&#xFF1A;</p>
<pre class="language-"><code>if (next_file_number_ &lt;= number) 
     next_file_number_ = number + 1;
</code></pre><p><strong>4 &#x5728;current version&#x4E0A;&#x5E94;&#x7528;&#x6307;&#x5B9A;&#x7684;VersionEdit&#xFF0C;&#x751F;&#x6210;&#x65B0;&#x7684;MANIFEST&#x4FE1;&#x606F;&#xFF0C;&#x4FDD;&#x5B58;&#x5230;&#x78C1;&#x76D8;&#x4E0A;&#xFF0C;&#x5E76;&#x7528;&#x4F5C;current version&#x3002;</strong>
&#x8981;&#x6C42;&#xFF1A;&#x6CA1;&#x6709;&#x5176;&#x5B83;&#x7EBF;&#x7A0B;&#x5E76;&#x53D1;&#x8C03;&#x7528;&#xFF1B;&#x8981;&#x7528;&#x4E8E;mu&#xFF1B;</p>
<pre class="language-"><code>Status LogAndApply(VersionEdit* edit, port::Mutex* mu)EXCLUSIVE_LOCKS_REQUIRED(mu);
</code></pre><p><strong>5 &#x5BF9;&#x4E8E;@v&#x4E2D;&#x7684;@key&#xFF0C;&#x8FD4;&#x56DE;db&#x4E2D;&#x7684;&#x5927;&#x6982;&#x4F4D;&#x7F6E;</strong></p>
<pre class="language-"><code>uint64_t ApproximateOffsetOf(Version* v, const InternalKey&amp; key);
</code></pre><p><strong>6 &#x5176;&#x5B83;&#x4E00;&#x4E9B;&#x7B80;&#x5355;&#x63A5;&#x53E3;&#xFF0C;&#x4FE1;&#x606F;&#x83B7;&#x53D6;&#x6216;&#x8005;&#x8BBE;&#x7F6E;&#xFF0C;&#x5982;&#x4E0B;&#xFF1A;</strong></p>
<pre class="language-"><code>//&#x8FD4;&#x56DE;current version
Version* current() const {
     return current_; 
}   

// &#x5F53;&#x524D;&#x7684;MANIFEST&#x6587;&#x4EF6;&#x53F7;  
uint64_t ManifestFileNumber() const {
     return manifest_file_number_;
} 

// &#x5206;&#x914D;&#x5E76;&#x8FD4;&#x56DE;&#x65B0;&#x7684;&#x6587;&#x4EF6;&#x7F16;&#x53F7;  
uint64_t NewFileNumber() {
     return next_file_number_++; 
} 

// &#x8FD4;&#x56DE;&#x5F53;&#x524D;log&#x6587;&#x4EF6;&#x7F16;&#x53F7;  
uint64_t LogNumber() const { 
     return log_number_; 
}

// &#x8FD4;&#x56DE;&#x6B63;&#x5728;compact&#x7684;log&#x6587;&#x4EF6;&#x7F16;&#x53F7;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;0  
uint64_t PrevLogNumber() const {
     return prev_log_number_; 
}

// &#x83B7;&#x53D6;&#x3001;&#x8BBE;&#x7F6E;last sequence&#xFF0C;set&#x65F6;&#x4E0D;&#x80FD;&#x540E;&#x9000;  
uint64_t LastSequence() const {
     return last_sequence_; 
}

void SetLastSequence(uint64_t s) {  
    assert(s &gt;=last_sequence_);  
    last_sequence_ = s;  
}  

// &#x8FD4;&#x56DE;&#x6307;&#x5B9A;level&#x4E2D;&#x6240;&#x6709;sstable&#x6587;&#x4EF6;&#x5927;&#x5C0F;&#x7684;&#x548C;  
int64_t NumLevelBytes(int level) const;  

// &#x8FD4;&#x56DE;&#x6307;&#x5B9A;level&#x7684;&#x6587;&#x4EF6;&#x4E2A;&#x6570;  
int NumLevelFiles(int level) const;  

// &#x91CD;&#x7528;@file_number&#xFF0C;&#x9650;&#x5236;&#x5F88;&#x4E25;&#x683C;&#xFF1A;@file_number&#x5FC5;&#x987B;&#x662F;&#x6700;&#x540E;&#x5206;&#x914D;&#x7684;&#x90A3;&#x4E2A;  
// &#x8981;&#x6C42;: @file_number&#x662F;NewFileNumber()&#x8FD4;&#x56DE;&#x7684;.  

void ReuseFileNumber(uint64_t file_number) {  
    if (next_file_number_ ==file_number + 1) next_file_number_ = file_number;  
}  

// &#x5BF9;&#x4E8E;&#x6240;&#x6709;level&gt;0&#xFF0C;&#x904D;&#x5386;&#x6587;&#x4EF6;&#xFF0C;&#x627E;&#x5230;&#x548C;&#x4E0B;&#x4E00;&#x5C42;&#x6587;&#x4EF6;&#x7684;&#x91CD;&#x53E0;&#x6570;&#x636E;&#x7684;&#x6700;&#x5927;&#x503C;(in bytes)  
// &#x8FD9;&#x4E2A;&#x5C31;&#x662F;Version:: GetOverlappingInputs()&#x51FD;&#x6570;&#x7684;&#x7B80;&#x5355;&#x5E94;&#x7528;  
int64_t MaxNextLevelOverlappingBytes(); 

// &#x83B7;&#x53D6;&#x51FD;&#x6570;&#xFF0C;&#x628A;&#x6240;&#x6709;version&#x7684;&#x6240;&#x6709;level&#x7684;&#x6587;&#x4EF6;&#x52A0;&#x5165;&#x5230;@live&#x4E2D;  
void AddLiveFiles(std::set<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>uint64_t</span><span class="token punctuation">&gt;</span></span>* live);  

// &#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x53EF;&#x8BFB;&#x7684;&#x5355;&#x884C;&#x4FE1;&#x606F;&#x2014;&#x2014;&#x6BCF;&#x4E2A;level&#x7684;&#x6587;&#x4EF6;&#x6570;&#xFF0C;&#x4FDD;&#x5B58;&#x5728;*scratch&#x4E2D;  
struct LevelSummaryStorage {char buffer[100]; };  
const char* LevelSummary(LevelSummaryStorage* scratch) const;
</code></pre><p>&#x4E0B;&#x9762;&#x5C31;&#x6765;&#x5206;&#x6790;&#x8FD9;&#x4E24;&#x4E2A;&#x63A5;&#x53E3;<code>Recover</code>&#x3001;<code>LogAndApply</code>&#x4EE5;&#x53CA;<code>ApproximateOffsetOf</code>&#x3002;</p>
<h3 id="112-versionsetbuilder&#x7C7B;"><a name="112-versionsetbuilder&#x7C7B;" class="anchor-navigation-ex-anchor" href="#112-versionsetbuilder&#x7C7B;"><i class="fa fa-link" aria-hidden="true"></i></a>11.2 VersionSet::Builder&#x7C7B;</h3>
<p><code>Builder</code>&#x662F;&#x4E00;&#x4E2A;<strong>&#x5185;&#x90E8;&#x8F85;&#x52A9;&#x7C7B;</strong>&#xFF0C;&#x5176;&#x4E3B;&#x8981;&#x4F5C;&#x7528;&#x662F;&#xFF1A;
1 &#x628A;&#x4E00;&#x4E2A;<code>MANIFEST</code>&#x8BB0;&#x5F55;&#x7684;&#x5143;&#x4FE1;&#x606F;&#x5E94;&#x7528;&#x5230;&#x7248;&#x672C;&#x7BA1;&#x7406;&#x5668;<code>VersionSet</code>&#x4E2D;&#xFF1B;
2 &#x628A;&#x5F53;&#x524D;&#x7684;&#x7248;&#x672C;&#x72B6;&#x6001;&#x8BBE;&#x7F6E;&#x5230;&#x4E00;&#x4E2A;Version&#x5BF9;&#x8C61;&#x4E2D;&#x3002;</p>
<p><strong>11.2.1 &#x6210;&#x5458;&#x4E0E;&#x6784;&#x9020;</strong></p>
<p><code>Builder</code>&#x7684;vset<em>&#x4E0E;base</em>&#x90FD;&#x662F;&#x8C03;&#x7528;&#x8005;&#x4F20;&#x5165;&#x7684;&#xFF0C;&#x6B64;&#x5916;&#x5B83;&#x8FD8;&#x4E3A;<code>FileMetaData</code>&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;&#x6BD4;&#x8F83;&#x7C7B;<code>BySmallestKey</code>&#xFF0C;&#x9996;&#x5148;&#x4F9D;&#x7167;&#x6587;&#x4EF6;&#x7684;min key&#xFF0C;&#x5C0F;&#x7684;&#x5728;&#x524D;&#xFF1B;&#x5982;&#x679C;min key&#x76F8;&#x7B49;&#x5219;<code>file number</code>&#x5C0F;&#x7684;&#x5728;&#x524D;&#x3002;</p>
<pre class="language-"><code>typedefstd::set<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>FileMetaData*,</span> <span class="token attr-name">BySmallestKey</span><span class="token punctuation">&gt;</span></span> FileSet;  
// &#x8FD9;&#x4E2A;&#x662F;&#x8BB0;&#x5F55;&#x6DFB;&#x52A0;&#x548C;&#x5220;&#x9664;&#x7684;&#x6587;&#x4EF6;  
struct LevelState { 
  std::set<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>uint64_t</span><span class="token punctuation">&gt;</span></span>deleted_files;  
  // &#x4FDD;&#x8BC1;&#x6DFB;&#x52A0;&#x6587;&#x4EF6;&#x7684;&#x987A;&#x5E8F;&#x662F;&#x6709;&#x6548;&#x5B9A;&#x4E49;&#x7684;
  FileSet* added_files;   
};  
VersionSet* vset_;  
Version* base_;  
LevelStatelevels_[config::kNumLevels];  

// &#x5176;&#x63A5;&#x53E3;&#x6709;3&#x4E2A;&#xFF1A;  
void Apply(VersionEdit* edit);  
void SaveTo(Version* v);  
void MaybeAddFile(Version* v, int level, FileMetaData* f);
</code></pre><p>&#x6784;&#x9020;&#x51FD;&#x6570;&#x6267;&#x884C;&#x7B80;&#x5355;&#x7684;&#x521D;&#x59CB;&#x5316;&#x64CD;&#x4F5C;&#xFF0C;&#x5728;&#x6790;&#x6784;&#x65F6;&#xFF0C;&#x904D;&#x5386;&#x68C0;&#x67E5;<code>LevelState::added_files</code>&#xFF0C;&#x5982;&#x679C;&#x6587;&#x4EF6;&#x5F15;&#x7528;&#x8BA1;&#x6570;&#x4E3A;0&#xFF0C;&#x5219;&#x5220;&#x9664;&#x6587;&#x4EF6;&#x3002;</p>
<p><strong>11.2.2 Apply()</strong></p>
<p>&#x51FD;&#x6570;&#x58F0;&#x660E;&#xFF1A;<code>voidApply(VersionEdit* edit)</code>&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x5C06;edit&#x4E2D;&#x7684;&#x4FEE;&#x6539;&#x5E94;&#x7528;&#x5230;&#x5F53;&#x524D;&#x72B6;&#x6001;&#x4E2D;&#x3002;&#x6CE8;&#x610F;&#x9664;&#x4E86;<code>compaction</code>&#x70B9;&#x76F4;&#x63A5;&#x4FEE;&#x6539;&#x4E86;vset_&#xFF0C;&#x5176;&#x5B83;&#x5220;&#x9664;&#x548C;&#x65B0;&#x52A0;&#x6587;&#x4EF6;&#x7684;&#x53D8;&#x52A8;&#x53EA;&#x662F;&#x5148;&#x5B58;&#x50A8;&#x5728;Builder&#x81EA;&#x5DF1;&#x7684;&#x6210;&#x5458;&#x53D8;&#x91CF;&#x4E2D;&#xFF0C;&#x5728;&#x8C03;&#x7528;SaveTo(v)&#x51FD;&#x6570;&#x65F6;&#x624D;&#x65BD;&#x52A0;&#x5230;v&#x4E0A;&#x3002;</p>
<p><strong>S1 &#x628A;edit&#x8BB0;&#x5F55;&#x7684;compaction&#x70B9;&#x5E94;&#x7528;&#x5230;&#x5F53;&#x524D;&#x72B6;&#x6001;</strong></p>
<pre class="language-"><code>edit-&gt;compact_pointers_ =&gt; vset_-&gt;compact_pointer_
</code></pre><p><strong>S2 &#x628A;edit&#x8BB0;&#x5F55;&#x7684;&#x5DF2;&#x5220;&#x9664;&#x6587;&#x4EF6;&#x5E94;&#x7528;&#x5230;&#x5F53;&#x524D;&#x72B6;&#x6001;</strong></p>
<pre class="language-"><code>edit-&gt;deleted_files_ =&gt; levels_[level].deleted_files
</code></pre><p><strong>S3&#x628A;edit&#x8BB0;&#x5F55;&#x7684;&#x65B0;&#x52A0;&#x6587;&#x4EF6;&#x5E94;&#x7528;&#x5230;&#x5F53;&#x524D;&#x72B6;&#x6001;&#xFF0C;&#x8FD9;&#x91CC;&#x4F1A;&#x521D;&#x59CB;&#x5316;&#x6587;&#x4EF6;&#x7684;allowed_seeks&#x503C;&#xFF0C;&#x4EE5;&#x5728;&#x6587;&#x4EF6;&#x88AB;&#x65E0;&#x8C13;seek&#x6307;&#x5B9A;&#x6B21;&#x6570;&#x540E;&#x81EA;&#x52A8;&#x6267;&#x884C;compaction&#xFF0C;&#x8FD9;&#x91CC;&#x4F5C;&#x8005;&#x9610;&#x8FF0;&#x4E86;&#x5176;&#x8BBE;&#x7F6E;&#x89C4;&#x5219;&#x3002;</strong></p>
<pre class="language-"><code>for (size_t i = 0; i <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>edit-</span><span class="token punctuation">&gt;</span></span>new_files_.size(); i++) {  
    const int level =edit-&gt;new_files_[i].first;  
    FileMetaData* f = newFileMetaData(edit-&gt;new_files_[i].second);  
    f-&gt;refs = 1;  
    f-&gt;allowed_seeks = (f-&gt;file_size /16384); // 16KB-&#x89C1;&#x4E0B;&#x9762;  
    if (f-&gt;allowed_seeks &lt;100) f-&gt;allowed_seeks = 100;  
    levels_[level].deleted_files.erase(f-&gt;number); // &#x4EE5;&#x9632;&#x4E07;&#x4E00;  
    levels_[level].added_files-&gt;insert(f);  
}
</code></pre><p>&#x503C;allowed_seeks&#x4E8B;&#x5173;compaction&#x7684;&#x4F18;&#x5316;&#xFF0C;&#x5176;&#x8BA1;&#x7B97;&#x4F9D;&#x636E;&#x5982;&#x4E0B;&#xFF0C;&#x9996;&#x5148;&#x5047;&#x8BBE;&#xFF1A;</p>
<blockquote>
<p>1 &#x4E00;&#x6B21;seek&#x65F6;&#x95F4;&#x4E3A;10ms
2 &#x5199;&#x5165;10MB&#x6570;&#x636E;&#x7684;&#x65F6;&#x95F4;&#x4E3A;10ms&#xFF08;100MB/s&#xFF09;
3 compact 1MB&#x7684;&#x6570;&#x636E;&#x9700;&#x8981;&#x6267;&#x884C;25MB&#x7684;IO
-&gt;&#x4ECE;&#x672C;&#x5C42;&#x8BFB;&#x53D6;1MB
-&gt;&#x4ECE;&#x4E0B;&#x4E00;&#x5C42;&#x8BFB;&#x53D6;10-12MB&#xFF08;&#x6587;&#x4EF6;&#x7684;key range&#x8FB9;&#x754C;&#x53EF;&#x80FD;&#x662F;&#x975E;&#x5BF9;&#x9F50;&#x7684;&#xFF09;
-&gt;&#x5411;&#x4E0B;&#x4E00;&#x5C42;&#x5199;&#x5165;10-12MB</p>
</blockquote>
<p>&#x8FD9;&#x610F;&#x5473;&#x8FD9;25&#x6B21;seek&#x7684;&#x4EE3;&#x4EF7;&#x7B49;&#x540C;&#x4E8E;<code>compact 1MB</code>&#x7684;&#x6570;&#x636E;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4E00;&#x6B21;seek&#x82B1;&#x8D39;&#x7684;&#x65F6;&#x95F4;&#x5927;&#x7EA6;&#x76F8;&#x5F53;&#x4E8E;<code>compact 40KB</code>&#x7684;&#x6570;&#x636E;&#x3002;&#x57FA;&#x4E8E;&#x4FDD;&#x5B88;&#x7684;&#x89D2;&#x5EA6;&#x8003;&#x8651;&#xFF0C;&#x5BF9;&#x4E8E;&#x6BCF;16KB&#x7684;&#x6570;&#x636E;&#xFF0C;&#x6211;&#x4EEC;&#x5141;&#x8BB8;&#x5B83;&#x5728;&#x89E6;&#x53D1;compaction&#x4E4B;&#x524D;&#x80FD;&#x505A;&#x4E00;&#x6B21;seek&#x3002;</p>
<p><strong>11.2.3 MaybeAddFile()</strong></p>
<p>&#x51FD;&#x6570;&#x58F0;&#x660E;&#xFF1A;</p>
<pre class="language-"><code>voidMaybeAddFile(Version* v, int level, FileMetaData* f);
</code></pre><p>&#x8BE5;&#x51FD;&#x6570;&#x5C1D;&#x8BD5;&#x5C06;f&#x52A0;&#x5165;&#x5230;<code>levels_[level]</code>&#x6587;&#x4EF6;set&#x4E2D;&#x3002;
&#x8981;&#x6EE1;&#x8DB3;&#x4E24;&#x4E2A;&#x6761;&#x4EF6;&#xFF1A;</p>
<blockquote>
<p>1 &#x6587;&#x4EF6;&#x4E0D;&#x80FD;&#x88AB;&#x5220;&#x9664;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4E0D;&#x80FD;&#x5728;levels<em>[level].deleted_files&#x96C6;&#x5408;&#x4E2D;&#xFF1B;
2 &#x4FDD;&#x8BC1;&#x6587;&#x4EF6;&#x4E4B;&#x95F4;&#x7684;key&#x662F;&#x8FDE;&#x7EED;&#x7684;&#xFF0C;&#x5373;&#x57FA;&#x4E8E;&#x6BD4;&#x8F83;&#x5668;vset</em>-&gt;icmp<em>&#xFF0C;f&#x7684;min key&#x8981;&#x5927;&#x4E8E;levels</em>[level]&#x96C6;&#x5408;&#x4E2D;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#x7684;max key&#xFF1B;</p>
</blockquote>
<p><strong>11.2.4 SaveTo()</strong></p>
<p>&#x628A;&#x5F53;&#x524D;&#x7684;&#x72B6;&#x6001;&#x5B58;&#x50A8;&#x5230;v&#x4E2D;&#x8FD4;&#x56DE;&#xFF0C;&#x51FD;&#x6570;&#x58F0;&#x660E;&#xFF1A;</p>
<pre class="language-"><code>void SaveTo(Version* v);
</code></pre><p>&#x51FD;&#x6570;&#x903B;&#x8F91;&#xFF1A;For&#x5FAA;&#x73AF;&#x904D;&#x5386;&#x6240;&#x6709;&#x7684;<code>level[0, config::kNumLevels-1]</code>&#xFF0C;&#x628A;&#x65B0;&#x52A0;&#x7684;&#x6587;&#x4EF6;&#x548C;&#x5DF2;&#x5B58;&#x5728;&#x7684;&#x6587;&#x4EF6;merge&#x5728;&#x4E00;&#x8D77;&#xFF0C;&#x4E22;&#x5F03;&#x5DF2;&#x5220;&#x9664;&#x7684;&#x6587;&#x4EF6;&#xFF0C;&#x7ED3;&#x679C;&#x4FDD;&#x5B58;&#x5728;v&#x4E2D;&#x3002;&#x5BF9;&#x4E8E;level&gt; 0&#xFF0C;&#x8FD8;&#x8981;&#x786E;&#x4FDD;&#x96C6;&#x5408;&#x4E2D;&#x7684;&#x6587;&#x4EF6;&#x6CA1;&#x6709;&#x91CD;&#x5408;&#x3002;
<strong>S1 merge&#x6D41;&#x7A0B;</strong></p>
<pre class="language-"><code>// &#x539F;&#x6587;&#x4EF6;&#x96C6;&#x5408;
conststd::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>FileMetaData*</span><span class="token punctuation">&gt;</span></span>&amp; base_files = base_-&gt;files_[level];   
std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>FileMetaData*</span><span class="token punctuation">&gt;</span></span>::const_iterator base_iter =base_files.begin();  
std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>FileMetaData*</span><span class="token punctuation">&gt;</span></span>::const_iterator base_end =base_files.end();  
const FileSet* added =levels_[level].added_files;  
v-&gt;files_[level].reserve(base_files.size()+ added-&gt;size());  
for (FileSet::const_iteratoradded_iter = added-&gt;begin();
    added_iter !=added-&gt;end(); ++added_iter) {  
    //&#x52A0;&#x5165;base_&#x4E2D;&#x5C0F;&#x4E8E;added_iter&#x7684;&#x90A3;&#x4E9B;&#x6587;&#x4EF6;  

      for(std::vector<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>FileMetaData*</span><span class="token punctuation">&gt;</span></span>::const_iterator bpos = std::upper_bound(base_iter,base_end,*added_iter, cmp);  
        base_iter != bpos;++base_iter) { 
        // base_iter&#x9010;&#x6B21;&#x5411;&#x540E;&#x79FB;&#x5230;  
        MaybeAddFile(v, level,*base_iter);  
    }  
    // &#x52A0;&#x5165;added_iter  
    MaybeAddFile(v, level,*added_iter); 
 }  

   // &#x6DFB;&#x52A0;base_&#x5269;&#x4F59;&#x7684;&#x90A3;&#x4E9B;&#x6587;&#x4EF6;  
   for (; base_iter != base_end;++base_iter) 
      MaybeAddFile(v, level, *base_iter);
</code></pre><p>&#x5BF9;&#x8C61;cmp&#x5C31;&#x662F;&#x524D;&#x9762;&#x5B9A;&#x4E49;&#x7684;&#x6BD4;&#x8F83;&#x4EFF;&#x51FD;&#x6570;<code>BySmallestKey</code>&#x5BF9;&#x8C61;&#x3002;
<strong>S2 &#x68C0;&#x67E5;&#x6D41;&#x7A0B;&#xFF0C;&#x4FDD;&#x8BC1;level&gt;0&#x7684;&#x6587;&#x4EF6;&#x96C6;&#x5408;&#x65E0;&#x91CD;&#x53E0;&#xFF0C;&#x57FA;&#x4E8E;vset<em>-&gt;icmp</em>&#xFF0C;&#x786E;&#x4FDD;&#x6587;&#x4EF6;i-1&#x7684;max key &lt; &#x6587;&#x4EF6;i&#x7684;min key&#x3002;</strong></p>
<h3 id="113-recover"><a name="113-recover" class="anchor-navigation-ex-anchor" href="#113-recover"><i class="fa fa-link" aria-hidden="true"></i></a>11.3 Recover()</h3>
<p>&#x5BF9;&#x4E8E;<code>VersionSet</code>&#x800C;&#x8A00;&#xFF0C;<code>Recover</code>&#x5C31;&#x662F;&#x6839;&#x636E;<code>CURRENT</code>&#x6307;&#x5B9A;&#x7684;<code>MANIFEST</code>&#xFF0C;&#x8BFB;&#x53D6;db&#x5143;&#x4FE1;&#x606F;&#x3002;&#x8FD9;&#x662F;9.3&#x4ECB;&#x7ECD;&#x7684;Recovery&#x6D41;&#x7A0B;&#x7684;&#x5F00;&#x59CB;&#x90E8;&#x5206;&#x3002;</p>
<p><strong>11.3.1 &#x51FD;&#x6570;&#x6D41;&#x7A0B;</strong></p>
<p>&#x4E0B;&#x9762;&#x5C31;&#x6765;&#x5206;&#x6790;&#x5176;&#x5177;&#x4F53;&#x903B;&#x8F91;&#x3002;</p>
<p><strong>S1 &#x8BFB;&#x53D6;CURRENT&#x6587;&#x4EF6;&#xFF0C;&#x83B7;&#x5F97;&#x6700;&#x65B0;&#x7684;MANIFEST&#x6587;&#x4EF6;&#x540D;&#xFF0C;&#x6839;&#x636E;&#x6587;&#x4EF6;&#x540D;&#x6253;&#x5F00;MANIFEST&#x6587;&#x4EF6;&#x3002;CURRENT&#x6587;&#x4EF6;&#x4EE5;\n&#x7ED3;&#x5C3E;&#xFF0C;&#x8BFB;&#x53D6;&#x540E;&#x9700;&#x8981;trim&#x4E0B;&#x3002;</strong></p>
<pre class="language-"><code>std::string current; // MANIFEST&#x6587;&#x4EF6;&#x540D;  
ReadFileToString(env_, CurrentFileName(dbname_), &#xA4;t);  
std::string dscname = dbname_ + &quot;/&quot; + current;  
SequentialFile* file;  
env_-&gt;NewSequentialFile(dscname, &amp;file);
</code></pre><p><strong>S2 &#x8BFB;&#x53D6;MANIFEST&#x5185;&#x5BB9;&#xFF0C;MANIFEST&#x662F;&#x4EE5;log&#x7684;&#x65B9;&#x5F0F;&#x5199;&#x5165;&#x7684;&#xFF0C;&#x56E0;&#x6B64;&#x8FD9;&#x91CC;&#x8C03;&#x7528;&#x7684;&#x662F;log::Reader&#x6765;&#x8BFB;&#x53D6;&#x3002;&#x7136;&#x540E;&#x8C03;&#x7528;VersionEdit::DecodeFrom&#xFF0C;&#x4ECE;&#x5185;&#x5BB9;&#x89E3;&#x6790;&#x51FA;VersionEdit&#x5BF9;&#x8C61;&#xFF0C;&#x5E76;&#x5C06;VersionEdit&#x8BB0;&#x5F55;&#x7684;&#x6539;&#x52A8;&#x5E94;&#x7528;&#x5230;versionset&#x4E2D;&#x3002;&#x8BFB;&#x53D6;MANIFEST&#x4E2D;&#x7684;log number, prev log number, nextfile number, last sequence&#x3002;</strong></p>
<pre class="language-"><code>Builder builder(this, current_);  
while (reader.ReadRecord(&amp;record, &amp;scratch) &amp;&amp; s.ok()) {  
      VersionEdit edit;  
      s = edit.DecodeFrom(record);  
      if (s.ok())builder.Apply(&amp;edit);  
      // log number, file number, &#x2026;&#x9010;&#x4E2A;&#x5224;&#x65AD;  
      if (edit.has_log_number_) { 
          log_number =edit.log_number_;  
          have_log_number = true;  
      }  
      &#x2026; &#x2026;  
}
</code></pre><p><strong>S3 &#x5C06;&#x8BFB;&#x53D6;&#x5230;&#x7684;log number, prev log number&#x6807;&#x8BB0;&#x4E3A;&#x5DF2;&#x4F7F;&#x7528;&#x3002;</strong></p>
<pre class="language-"><code>MarkFileNumberUsed(prev_log_number);
MarkFileNumberUsed(log_number);
</code></pre><p><strong>S4 &#x6700;&#x540E;&#xFF0C;&#x5982;&#x679C;&#x4E00;&#x5207;&#x987A;&#x5229;&#x5C31;&#x521B;&#x5EFA;&#x65B0;&#x7684;Version&#xFF0C;&#x5E76;&#x5E94;&#x7528;&#x8BFB;&#x53D6;&#x7684;&#x51E0;&#x4E2A;number&#x3002;</strong></p>
<pre class="language-"><code>if (s.ok()) {  
    Version* v = newVersion(this);  
    builder.SaveTo(v);  
    // &#x5B89;&#x88C5;&#x6062;&#x590D;&#x7684;version  
    Finalize(v);  
    AppendVersion(v);  
    manifest_file_number_ =next_file;  
    next_file_number_ = next_file+ 1;  
    last_sequence_ = last_sequence;  
    log_number_ = log_number;  
    prev_log_number_ =prev_log_number;  
}
</code></pre><p><code>Finalize(v)</code>&#x548C;<code>AppendVersion(v)</code>&#x7528;&#x6765;&#x5B89;&#x88C5;&#x5E76;&#x4F7F;&#x7528;version v&#xFF0C;&#x5728;<code>AppendVersion</code>&#x51FD;&#x6570;&#x4E2D;&#x4F1A;&#x5C06;<code>current version</code>&#x8BBE;&#x7F6E;&#x4E3A;v&#x3002;&#x4E0B;&#x9762;&#x5C31;&#x6765;&#x5206;&#x522B;&#x5206;&#x6790;&#x8FD9;&#x4E24;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<p><strong>11.3.2 Finalize()</strong></p>
<p>&#x51FD;&#x6570;&#x58F0;&#x660E;&#xFF1A;</p>
<pre class="language-"><code>void Finalize(Version*v);
</code></pre><p>&#x8BE5;&#x51FD;&#x6570;&#x4F9D;&#x7167;&#x89C4;&#x5219;&#x4E3A;&#x4E0B;&#x6B21;&#x7684;compaction&#x8BA1;&#x7B97;&#x51FA;&#x6700;&#x9002;&#x7528;&#x7684;level&#xFF0C;&#x5BF9;&#x4E8E;level 0&#x548C;&gt;0&#x9700;&#x8981;&#x5206;&#x522B;&#x5BF9;&#x5F85;&#xFF0C;&#x903B;&#x8F91;&#x5982;&#x4E0B;&#x3002;</p>
<p><strong>S1 &#x5BF9;&#x4E8E;level 0&#x4EE5;&#x6587;&#x4EF6;&#x4E2A;&#x6570;&#x8BA1;&#x7B97;&#xFF0C;kL0_CompactionTrigger&#x9ED8;&#x8BA4;&#x914D;&#x7F6E;&#x4E3A;4&#x3002;</strong></p>
<pre class="language-"><code>score =v-&gt;files_[level].size()/static_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>double</span><span class="token punctuation">&gt;</span></span>(config::kL0_CompactionTrigger);
</code></pre><p><strong>S2 &#x5BF9;&#x4E8E;level&gt;0&#xFF0C;&#x6839;&#x636E;level&#x5185;&#x7684;&#x6587;&#x4EF6;&#x603B;&#x5927;&#x5C0F;&#x8BA1;&#x7B97;</strong></p>
<pre class="language-"><code>const uint64_t level_bytes = TotalFileSize(v-&gt;files_[level]);
score = static_cast<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>double</span><span class="token punctuation">&gt;</span></span>(level_bytes) /MaxBytesForLevel(level);
</code></pre><p><strong>S3 &#x6700;&#x540E;&#x628A;&#x8BA1;&#x7B97;&#x7ED3;&#x679C;&#x4FDD;&#x5B58;&#x5230;v&#x7684;&#x4E24;&#x4E2A;&#x6210;&#x5458;compaction<em>level</em>&#x548C;compaction<em>score</em>&#x4E2D;&#x3002;</strong></p>
<p>&#x5176;&#x4E2D;&#x51FD;&#x6570;MaxBytesForLevel&#x6839;&#x636E;level&#x8FD4;&#x56DE;&#x5176;&#x672C;&#x5C42;&#x6587;&#x4EF6;&#x603B;&#x5927;&#x5C0F;&#x7684;&#x9884;&#x5B9A;&#x6700;&#x5927;&#x503C;&#x3002;
&#x8BA1;&#x7B97;&#x89C4;&#x5219;&#x4E3A;&#xFF1A;<strong>1048576.0* level^10</strong>&#x3002;
&#x8FD9;&#x91CC;&#x5C31;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x4E3A;&#x4F55;level0&#x548C;&#x5176;&#x5B83;level&#x8BA1;&#x7B97;&#x65B9;&#x6CD5;&#x4E0D;&#x540C;&#xFF0C;&#x539F;&#x56E0;&#x5982;&#x4E0B;&#xFF0C;&#x8FD9;&#x4E5F;&#x662F;leveldb&#x4E3A;<code>compaction</code>&#x6240;&#x505A;&#x7684;&#x53E6;&#x4E00;&#x4E2A;&#x4F18;&#x5316;&#x3002;</p>
<blockquote>
<p>1 &#x5BF9;&#x4E8E;&#x8F83;&#x5927;&#x7684;&#x5199;&#x7F13;&#x5B58;&#xFF08;write-buffer&#xFF09;&#xFF0C;&#x505A;&#x592A;&#x591A;&#x7684;level 0 compaction&#x5E76;&#x4E0D;&#x597D;
2 &#x6BCF;&#x6B21;read&#x64CD;&#x4F5C;&#x90FD;&#x8981;merge level 0&#x7684;&#x6240;&#x6709;&#x6587;&#x4EF6;&#xFF0C;&#x56E0;&#x6B64;&#x6211;&#x4EEC;&#x4E0D;&#x5E0C;&#x671B;level 0&#x6709;&#x592A;&#x591A;&#x7684;&#x5C0F;&#x6587;&#x4EF6;&#x5B58;&#x5728;&#xFF08;&#x6BD4;&#x5982;&#x5199;&#x7F13;&#x5B58;&#x592A;&#x5C0F;&#xFF0C;&#x6216;&#x8005;&#x538B;&#x7F29;&#x6BD4;&#x8F83;&#x9AD8;&#xFF0C;&#x6216;&#x8005;&#x8986;&#x76D6;/&#x5220;&#x9664;&#x8F83;&#x591A;&#x5BFC;&#x81F4;&#x5C0F;&#x6587;&#x4EF6;&#x592A;&#x591A;&#xFF09;&#x3002;
&#x770B;&#x8D77;&#x6765;&#x8FD9;&#x91CC;&#x7684;&#x5199;&#x7F13;&#x5B58;&#x5E94;&#x8BE5;&#x5C31;&#x662F;&#x914D;&#x7F6E;&#x7684;&#x64CD;&#x4F5C;log&#x5927;&#x5C0F;&#x3002;</p>
</blockquote>
<p><strong>11.3.3 AppendVersion()</strong></p>
<p>&#x51FD;&#x6570;&#x58F0;&#x660E;&#xFF1A;</p>
<pre class="language-"><code>void AppendVersion(Version*v);
</code></pre><p>&#x628A;v&#x52A0;&#x5165;&#x5230;<code>versionset</code>&#x4E2D;&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;&#x4E3A;<code>current version</code>&#x3002;&#x5E76;&#x5BF9;&#x8001;&#x7684;<code>current version</code>&#x6267;&#x884C;Uref()&#x3002;
&#x5728;&#x53CC;&#x5411;&#x5FAA;&#x73AF;&#x94FE;&#x8868;&#x4E2D;&#x7684;&#x4F4D;&#x7F6E;&#x5728;<code>dummy_versions_</code>&#x4E4B;&#x524D;&#x3002;</p>
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